Failing to prepare will cause one to lose or fail

Death balances all.

Allegedly; it is said (that)...

Synonym of attack is the best form of defence

(figuratively, humorous, simile) A woman is capable of living a complete and independent life without a man.

Alternative spelling of attack is the best form of defence

Who is suffering or losing out in a given situation.

(informal) Trouble will happen soon.

(rare) Alternative form of an ounce of prevention is better than a pound of cure

Cleverness and education can be gained only by effort.